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Johns Manville Spider™ Spray-in Insulation and the JM Spider Insulation Delivery System offer a revolutionary way to insulate homes. Spider is lightweight fiber glass insulation bound together with a non-toxic, water-soluble adhesive that also binds to cavity surfaces for gap-free coverage. Spider’s variable thickness levels can fill 2" x 4" cavities up to an R-15 thermal rating, and 2" x 6" cavities up to R-23. JM Spider fills a regular (2" x 4") cavity in 10-20 seconds and dries in 2-8 hours – six times faster than cellulose. Energy Efficient – When professionally installed, each year Spider saves 12 times the energy required to produce it.

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JM’s new formaldehyde-free products provide the same great performance you’ve come to expect - only without the formaldehyde - so you have one less thing to worry about. Why did we take the formaldehyde out? Because we listen to our customers.
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